Starting pulley



Feb. 7, 1933. R. J. BARTHOLOMEW STARTING PULLEY Filed Jan. 3, 1951 g Z INVENTOR.

BY QQL (3,. We; :2 7m ATTORN vs.

Patented Feb. 7, 1933' ROBERT rnnnrnonomnw, or nRMANrown, rnnnsxnvnmanssxenon rornnrcnnn wonxs, moonronn'rnn, or PHILADELPHIA, rnnnsxnvnivm, nhoonronnrronor PENNSYLVANIA summaris s? Application filed January 3, 193 1. iSeria1 N0. 506,482. v

This invention relatesto an improvement in starting pulleys and is particularly Well" adapted for use in connection with motor driven spinners.

5 One of the objects of my invention is the provision of a starting pulley which is so constructed and arranged that when used in connection with a machinethe rate of acceleration of the machine from a condition 19 of rest to full operating speed is under conpulley embodying myinvention; and

Flg. 2 is a section on the line 2 2 of Fig.1. and :the'sleeve. 2

Referring to the drawing in detail, 1 designates the driven shaft of a spinning machine, n

-1-n-the.i drawlng, 1t; Wlll be notedthat four slots are provided which insure'zfourjpoints .3

for example, this shaft carrying one of the pulleys for the spindle belt of the spinner as will be understood. On the'shaft 1 is mounted a sleeve 2, this sleeve being threaded at both ends as seen at 3 and 4:, the threads being of equal diameter and lead. This sleeve is provided at each end with cross slots 5 and 6. e

Surrounding the sleeve 2 and intermediate its ends is a bushing 7 and immediately surrounding this bushing is the main portion 8 of the pulley. It will be observed that the pulley is provided with an annular groove 9 and annular groove 10 in its upper and lower faces, respectively. The bottoms of these grooves are spaced to provide a web 11.

Received by the upper groove 9 and surrounding the fiange 12 of the pulleyis a friction ring 13 which may be made of cork, for instance, and over this ring is a friction disc 14 of metal provided with keys 15 pro- Fig. 1is a cross section of'an assembled t-heir'.:in ner ends and the keysof, the friction disc 1=4 'which is ample for adjustment over the required range and'for taking up from th adju ng-nut2 5 Byth sa ran -i jecitiing intoi'thesiliotvsi 11 1 uPP Qr' .b

the'sleeve2i- The groove '10 is provided with; a similar friction ring 16 and,ovei'lyingth-isringis a friction. disc 17 similar to the frictiondisc 14 15.

provided with keys 18 which enter. the slots,

6 inthe lower part of the sleeve 2. .The

friction "ring 16 it is to be noted is of: less thicknessthan the friction ring 113;

Threaded upon the upper end oftthe sleeve 29.0 2 1s an ad usting nut 20 and threaded lupon the lower end of-the sleeve is a clamping nut .21. It is toibe noted that theouter-end of the nut 21 is provided :with a tapered bore as shown'at 22, the-lower end of the sleeve :95

2 being correspondingly tapered. The radial cross slots .5 intheupperend of the sleeve2,' as above rnen'tiond, receive the dr1ving-keys-15 on the disc 14:,kwhile theradial cross slots 6 in thelo'wer end of $1. the sleeve receiveithekeys 18.0f the disc 17 These slotsalso. permitroff limited..icollapse 'Of':tl1*-;Sle Ve' 2.;under thevradial -pressure exerted; by the :taperediinside "surface of the clamping 'nut 21-,thus permitting secure? and Q15 concentric engagementbetween the! shaft 1 On the-lower end of thesleeve'gas viewed 1 of engagement of the sleeve with the-shaft when the sleeve. isic-ollapsed. Theaslots'are of: suflicient length to permit of amplesaxial movement of the clamping nut 21 :so that the latter willffunction before the'keys 18 e335 abut the inner ends of the slots 19. Likewise it is'to be understood tli'at-theslots at the upp eri. end-, of the sleeveare of. a gsuflicient 'length'or depth to provide'clearance between wear onxthefriction rings. A

" centrally located with respect to the center.

in of t pul ey, t pe-5' e n p tione on the. side of the pulley web farthest away f to full speed.

Tand judgment of the operators. Such ma chines are generally driven by individual electric motors through long belts, often 7 forty feet in length, which may drive the spindles at an ultimate speed ,of 16090 reyolutions a minute. If such machines are start ed abruptly great variations in the time at which all spindles have arrived at synchronism'occurs', the slower running feed mech anism operating at its operating speed before any 'of them. As a consequence there is a great variation in the twistof the yarns at substantially every spindle of the machine until all spindles have arrived at full operating speedf By applying a pulley of the character above described to the drive shaft 1 which as above explained carries one of the pulleys for the spindle belt acceleration may be varied at willby simply adjusting its supporting shaft without disturbing the driving connection between the friction disc and sleeve, and a nut threaded on the other end of said sleeve for varying the pressure of said disc on said friction ring thereby varying the pressure of the friction ring against said outer member. v

"Th's specificat'on signed this 27 day of December, 30- V OBERT, .J. BARTHQLQMEW.

the friction of the pulley on the shaft soas to insure proper speed of all .of the spindles at all times, i. e., from a position of ,rest'up 'WhatI claim is 7 1. A starting pulley comprising in combination an outer member, acentral sleeve, said sleeve being threaded ateach-end, said outer member'being-provided with upper and lower annular grooves, a; friction ring each groove, a friction disc each groove f overlying said rlngs, said sleeve :bemg slotted axially, keys on said discs entering-said I slots, and a member threaded on each end of said sleeve, forcontrolling the pressure ofsaid discs on said'rings and for contracting the sleeve to effect rotation thereof with a supporting shaft.

QJA starting pulley comprisingcombination an outer member, an 1nner concentric sleeve adapted to receive a supporting shaft, 7 l

friction rings carried'by said outer member and surrounding said sleeve, said rings being of different thicknesses, a friction disc engagingeach-ring and having a driving connection to'said sleeve, and an adjusting nut threaded on the end ofsaid sleeve re mote from the thinner of saidfriction i 3;. A' starting pulley comprising in combination an outer member, an inner concentric sleeve adaptedto receive a sup'portingshaft, a friction ring unattached to but engaging said outer member, a cooperating disc having Ja'drivingconnection with said sleeve, a nut having tapered bore threaded upon one end of said sleeve to contract the sleeve thereby frictionally toconnect' the sleeve to 

